Recent Posts

1

Test Equipment / Re: Choosing between entry-level 12-bit DSOs

« Last post by Mechatrommer on Today at 04:27:28 pm »

Compared to violating Nyquist.

please note what you keep talking is a combination of sample rate and Sinc reconstruction. turn off Sinc and your point will become moot granted signal can be a little weird newr Nyquist limit using "Line" or vector plot. we are waiting Rigol to enable back turning off Sinc feature in newer FW that they should not fucked up with in the first place.

2

Programming / Re: Linux Dependency Black Hole

« Last post by mag_therm on Today at 04:27:17 pm »

Hi tatel,
The install of MCUXpresso was failing on "can't find Python3.8"  So one of my questions was "Why does it specifically need 3.8, when higher versions of python are already installed in their correct paths."
So I had to install pyenv which allows download of any python3 version.

What happened today, there is a new version of MCUX .deb.bin in NXP along with updated manuals ( I had downloaded the old version about 3 days ago )  I  have just downloaded new version now.

3

Test Equipment / Re: Multimeter selection for production testing

« Last post by 2N3055 on Today at 04:24:04 pm »

The KS34465A and SDM3065X have no problem handing these current ranges for a single set of terminals. KS has a 3A max terminal that also supports 1ua range (as well as a 10A range on another terminal) and the SDM has 10A terminal that supports a 200ua range.

Also the DMM6500 terminal that surrorts 3A and 10ua range.

We just checked all of these to be sure

Best,

That I have no doubt, and that is what Tszaboo said was specified in original testing proc (KS34465A  was).

But if slight adjustment to test scripts can enable him to use SDM3045X that is 4-5x price reduction, and he will still be well over accuracy specs needed.

I still recommend checking if SDM3045X switches between needed ranges seamlessly or is it "brake-before-make" when switching shunts.

4

Test Equipment / Re: DP100 PD-Power Supply 100Watt [0-30.00V / 0-5.000A) [∼50$]

« Last post by Dexter2 on Today at 04:23:06 pm »

I have received the DP100 PFET update PCB i designed a few days back and as promised below short update instructions and Gerber files if someone else wants to update this power supply.

First the measurement. The output switches now ON-OFF in about the same time with no load attached now. There is no coupled noise on the output anymore. It now performs as it should...



Upgrade procedure:

• Disassemble the unit
• Remove N-ch MOSFET, TVS, Fuse, LED, LED resistor and clean all pads from exes solder to get a nice flat surface, also clean the solder from TH capacitor pins
• Apply some capton tape the the back of the PCB (solder stop is not a guarantied insulator)
• Place the PCB to DP100 PCB and position with output terminal screws, and after that solder the PCB to the TH capacitor pins
• On the top part of PCB mount the TVS and a 100nF capacitor
• Connect the 5V and Enable wire
• Put everything back together

I also tested the thermal performance with shorted output at 5A (worst case scenario for P-FET). And it works perfect and its also dead cool. You could use a 10 or even 20mohm lower performance part...




I have 3 spare PCBs so if someone needs i can send them out for free.

5

Other Equipment & Products / Re: Pace ADS200 soldering station

« Last post by shabaz on Today at 04:22:41 pm »

Since it's (perhaps) unlikely that the transformer has changed in the Plus version, the current board layout looks straightforward enough that, worst-case, once someone takes high-res photos of the Plus board, perhaps it's possible to easily reverse-engineer any potential board modifications, if it's not just a firmware upgrade.

It would be nice if Pace supplied a modification guide (ideally with a components pack e.g. the Flash chip, etc, or at least a parts list and firmware download), or a replacement board swap offer (say at a very low cost) because it's unfair to existing owners if there is no upgrade path.

Just speculating, but I suspect it's going to be an easily solvable problem with few changes since they labeled it Plus rather than (say) ADS210 or 250 or whatever! and they also mention that it's the same price.

6

Beginners / Re: LM317 Based Digitally Controlled Power Supply

« Last post by aliarifat794 on Today at 04:22:09 pm »

Here is also an adjustable power supply design featuring LM317 and LM337. You can see it for further improvement. It uses two voltage regulators, an LM317 for positive voltage and an LM337 for negative voltage.
https://www.pcbway.com/project/shareproject/LM317_AND_LM337_ADJUSTABLE_POWER_SUPPLY_CIRCUIT_BOARD_904eaf4a.html

7

Test Equipment / Re: Choosing between entry-level 12-bit DSOs

« Last post by ebastler on Today at 04:20:57 pm »

So yeah not the same, not even close...

I agree, and did not mean to imply that the two limitations are comparable. Just the pattern of argumentation.

Having used the SDS814X HD for nearly two months now, I can confirm that the resolution limitation is not a problem -- although I do notice it at times, especially with flattish signal slopes. If I had shelled out extra money for the larger screen in a 1000X HD, I would probably be annoyed about it.

8

Test Equipment / Re: Choosing between entry-level 12-bit DSOs

« Last post by 2N3055 on Today at 04:20:16 pm »

But facts are facts and DHO900 is hardware that is a shame of Rigol and should not have left prototype phase. It is a 250MHz scope (claimed) that in worst case samples at 156MSps/s which is FINRSI type of specmanship.

No disagreement there, but let's not forget the Siglent logic adapter is severely compromised, too.

No it is not severely compromised, it has certain limitations. That are clearly documented, and you actually heard it from "Siglent crowd". There are limitations in real time zoom, and triggering from mixed channels.
But OTOH, it samples at blazing 1GS/s and does not impact scope own sampling or memory.

So limited it is, compromised it is not.

9

Test Equipment / Re: Choosing between entry-level 12-bit DSOs

« Last post by Fungus on Today at 04:19:44 pm »

If you use your DHO800 at factory 125Mhz it is all good and well and no problem.

It's enough for me right now.

If I need more bandwidth I can just double-click a .bat file on my PC and I can have 250MHz in 10 seconds.

(nb. You don't need to reboot, just kill/restart the 'scope app).

I'm aware of the limits when I do that. It's very easy to turn channels on/off to check for aliasing.

10

Test Equipment / Re: Multimeter selection for production testing

« Last post by mawyatt on Today at 04:17:58 pm »

The KS34465A and SDM3065X have no problem handing these current ranges for a single set of terminals. KS has a 3A max terminal that also supports 1ua range (as well as a 10A range on another terminal) and the SDM has 10A terminal that supports a 200ua range.

Also the DMM6500 terminal that surrorts 3A and 10ua range.

We just checked all of these to be sure

Best,